Torsion Bar Set - E Type Jaguar - .800 Dia X 32.31 Long - Tubular
SKU 4720T-800
Category: Jaguar E-Type High-Performance Torsion Bars (Tubular Fast Road Spec)
The 4720T-800 represents a sophisticated blending of classic British chassis tuning and modern motorsports engineering. Featuring a 0.800" outer diameter paired with an advanced tubular (hollow) construction, this set is optimized as a "Fast Road Spec" for the longitudinal front suspension of the Jaguar E-Type. It delivers a calculated increase in front roll stiffness—sharpening steering feedback and controlling nose-dive under heavy braking—while shedding significant structural weight compared to solid aftermarket bars.
Performance & Fitment
Application: Jaguar E-Type (Series 1, 2, and 3 variants utilizing the standard factory longitudinal layout).
Outer Diameter: 0.800". Provides a firmer, more athletic spring rate that modernizes the car's handling dynamics without causing a harsh or unyielding ride on public roads.
Length: 32.31" (Exact factory longitudinal length dimensional replacement).
Design: Tubular (Hollow) Construction. Engineered to drastically reduce unsprung and overall chassis mass while delivering uncompromised structural strength.
Premium Construction
Material: Heat-Treated Alloy Steel. Forged from premium racing-grade steel designed to handle continuous structural twisting without sagging or losing its spring memory over time.
Manufacturing Process: Centerless Ground. The outer body of the tube is ground to a mirror finish, maintaining absolute diameter consistency. This precision removing of all microscopic surface imperfections eliminates potential "stress risers" where fractures typically form under load.
Coating: Heavy-Duty Powder Coating. Seals the raw steel against road moisture, engine oil leaks, and road salt, ensuring long-term protection against corrosive pitting.
🇬🇧 Classic Jaguar Suspension Tech & Installation Notes
Upgrading to a high-performance tubular torsion bar system requires precision setup to unlock its full handling potential:
❌ The Tubular Advantage Explained: In any torsion bar, the outer skin carries nearly all the twisting load, while the metal in the very center does very little structural work. By replacing that dead center mass with air, the 4720T-800 matches the stiffness of a solid 0.800" bar while cutting weight, making it easier for your front shocks and wishbones to manage high-speed road anomalies.
⚠️ Caution: High-Tension Energy: Torsion bars store an immense amount of mechanical energy. Before loosening or attempting to remove your existing bars, you must use an E-Type torsion bar unloading tool or safely support the lower wishbone assembly to completely relieve the tension. Attempting to force a loaded bar out can cause catastrophic personal injury and permanently distort the chassis anchorage points.
❌ The Spline Indexing System: Jaguar engineered the front and rear splines of the E-Type torsion bars with a different number of teeth (fine vernier adjustment). This allows you to fine-tune the front ride height. Rotating the bar a single notch in the lower wishbone vs. one notch in the rear chassis reaction plate changes the front trim height by minute fractions of an inch, making it easy to level and corner-balance the front end perfectly.
❌ Spline Sockets Cleanout: Over decades, the splined sockets inside the front lower wishbones and the rear reaction plate gather road grime, hardened grease, and surface rust. Before sliding the new 4720T-800 bars into place, thoroughly clean out these internal receivers with a wire brush and a premium penetrating solvent. Forcing a new bar into a clogged socket can easily strip the splines.
❌ Anti-Seize and Lubrication: Always apply a generous coat of heavy-duty, waterproof anti-seize or a moly-based grease to both splined ends before installation. Because these splines must allow for slight movement as the lower control arm moves through its suspension arc, running them dry will cause severe squeaking, internal corrosion, and eventual seizure.
❌ Maintain Left & Right Orientation: Torsion bars are directional. They are structurally pre-stressed in a specific direction during manufacturing or take a permanent "set" based on the rotational torque of supporting the car. Ensure you inspect the bar ends for Left (Passenger side on LHD) and Right (Driver side on LHD) stamps. Swapping their sides will force the metal grain to untwist against its set, causing rapid ride height sag or premature bar failure.
What’s Included
(1) Pair of Tubular Torsion Bars for E Type Jaguar
Warranty
Backed by a 1-year warranty for peace of mind.
Stock Information
Available for backorder.